Alert archive / Arkansas / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 290

May 28, 201742 counties in Arkansas; 33 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2017, 12:18 AM CDT for 42 counties in Arkansas; 33 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2017, 12:18 AM CDT (05:18 UTC)
Expired: May 28, 2017, 6:08 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 75 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Marshall County, MS, Monroe County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS

The radar

The Little Rock radar (KLZK), 52 km from the middle of the area, began a volume at 05:20 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 28, 12:30 AM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Lee, Pontotoc, Prentiss, Tishomingo, Union	45 min
May 28, 12:38 AM CDT	Severe Thunderstorm Warning	LZK	Conway, Garland, Logan, Perry, Pope, Scott and 1 more	37 min
May 28, 12:47 AM CDT	Severe Thunderstorm Warning	LZK	Montgomery, Polk, Scott	58 min
May 28, 12:49 AM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Conway, Faulkner, Johnson, Logan, Perry and 5 more	41 min
May 28, 12:56 AM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Lee, Monroe, Pontotoc	49 min
May 28, 1:07 AM CDT	Severe Thunderstorm Warning	LZK	Logan, Scott	53 min
May 28, 1:24 AM CDT	Severe Thunderstorm Warning	LZK	Conway, Faulkner, Grant, Jefferson, Lonoke, Perry and 4 more	26 min
May 28, 1:38 AM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Monroe	27 min
May 28, 1:40 AM CDT	Severe Thunderstorm Warning	LZK	Garland, Montgomery, Pike, Scott, Yell	50 min
May 28, 1:44 AM CDT	Severe Thunderstorm Warning	JAN	Clay, Lowndes	54 min
May 28, 2:07 AM CDT	Severe Thunderstorm Warning	LZK	Clark, Garland, Hot Spring, Perry, Pike, Saline and 1 more	53 min
May 28, 2:18 AM CDT	Tornado Warning	LZK	Garland, Perry, Saline, Yell	27 min
May 28, 2:29 AM CDT	Severe Thunderstorm Warning	LZK	Grant, Hot Spring, Jefferson, Saline	31 min
May 28, 2:48 AM CDT	Severe Thunderstorm Warning	LZK	Clark, Dallas, Grant, Hot Spring	57 min
May 28, 2:49 AM CDT	Severe Thunderstorm Warning	LZK	Cleveland, Grant, Jefferson, Lincoln	26 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Little Rock, AR (KBYH), launched 00:00Z, 5.3 hours before the alert went out and 169 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3385 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1096 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 15.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 7:01 PM CDT	Tornado Watch	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 20 more	6 hr
May 27, 9:26 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Independence and 8 more	94 min
May 27, 9:59 PM CDT	Tornado Watch	SPC	Crittenden, Cross, Lee, St. Francis	2 hr
May 27, 11:47 PM CDT	Mesoscale Discussion	SPC	Crawford, Sebastian, Washington	58 min
May 28, 12:06 AM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Columbia, Crawford, Franklin, Hempstead and 10 more	5 hr
May 28, 12:52 AM CDT	Mesoscale Discussion	SPC	Howard, Montgomery, Polk	23 min
May 28, 2:11 AM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Cleveland, Dallas, Desha, Faulkner and 12 more	2 hr
May 28, 2:53 AM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 6 more	2 hr
May 28, 4:59 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Cleveland, Columbia and 9 more	2 hr
May 27, 11:46 PM CDT	Mesoscale Discussion	SPC	Calhoun, Carroll, Chickasaw, Choctaw, Clay, Grenada and 12 more	59 min
May 28, 10:59 AM CDT	Mesoscale Discussion	SPC	George, Hancock, Harrison, Jackson, Pearl River, Stone	2 hr
May 27, 7:02 PM CDT	Mesoscale Discussion	SPC	Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 18 more	58 min
May 27, 9:07 PM CDT	Severe Thunderstorm Watch	SPC	Franklin, Giles, Lawrence, Lincoln, Moore, Wayne	8 hr
May 27, 9:46 PM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Carter, Claiborne and 24 more	89 min

Nearby

Severe Thunderstorm Watches in Arkansas, 2017 Severe Thunderstorm Watches in Mississippi, 2017 Every severe thunderstorm watch in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.